#!/usr/bin/env python3

import math
import sys

from common import print_solution, read_input


def distance(city1, city2):
    return math.sqrt((city1[0] - city2[0]) ** 2 + (city1[1] - city2[1]) ** 2)


def solve(cities):
    # Build a trivial solution.
    # Visit the cities in the order they appear in the input.
    return list(range(len(cities)))


if __name__ == '__main__':
    assert len(sys.argv) > 1
    solution = solve(read_input(sys.argv[1]))
    print_solution(solution)